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Leonard0 - 9:42 pm on Mar 29, 2006 (gmt 0)
It bans an IP if the number of accesses exceeds a certain amount over a specified time limit.
The script for banning bots (written by by xclus) is located in the PHP forum at [webmasterworld.com...] and also [webmasterworld.com...]
To speed up the process IPs are stored in a 2 to 4 digit hash so it may ban a few sites accidentally, especially on a busy site.